Why is there frost on my dehumidifier's coil?

Replace the dehumidifier compressor

The compressor is a pump that compresses the refrigerant that runs through the sealed system in the dehumidifier. If the compressor doesn't run when activated, have a refrigerator service technician replace it; by law, an EPA-licensed technician must complete this repair because it involves refrigerant.

Replace the dehumidifier condenser coil

The condenser is a heat exchanger that cools and condenses the hot, high-pressure refrigerant gas to a liquid state. The refrigerant then flows through the evaporator coil. If the compressor is running but the condenser cool and the evaporator is warm, the condenser or evaporator may have developed a refrigerant leak; by law, an EPA-licensed technician must to this repair because it involves refrigerant.

Replace the dehumidifier evaporator coil

The liquid refrigerant flows through the evaporator coil where moisture condenses and collects. If the compressor is running but the evaporator coil is warm and the condenser coil is cool, the evaporator or condenser coil may have developed a refrigerant leak; by law, an EPA-licensed technician must to this repair because it involves refrigerant.

Replace the dehumidifier fan motor

The fan motor rotates the fan blade that pulls air in through the front of the evaporator and pushes air out through the back of the condenser coil. The moisture in the air pulled in through the evaporator condenses on the evaporator coil. The air pushed out through the condenser causes the refrigerant to condense to a liquid. Replace the fan motor if it doesn't run when activated.